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Originally Posted by Iraqgunz
Primarily due to the mention in the Technical Manual which talks about swapping bolts, which is a headspace issue.
So you're saying that the repeated firing of the BCG/upper combo somehow wears them in together in such a way that they become "married"? They have comperable wear characteristics that are unique to that combo, and moving the BCG to a different upper will make them "mismatched"?
If I understand, the situation might be a BCG/Upper that has not had the headspace checked, not so much them not being mated/married. I don't think that there would be a problem swapping if you verified that all components were safe together. Someone please correct me if I'm mistaken.